JP3728693B2 - Polyester resin composition and hollow profile extrusion molded product - Google Patents

Polyester resin composition and hollow profile extrusion molded product Download PDF

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Publication number
JP3728693B2
JP3728693B2 JP2001232113A JP2001232113A JP3728693B2 JP 3728693 B2 JP3728693 B2 JP 3728693B2 JP 2001232113 A JP2001232113 A JP 2001232113A JP 2001232113 A JP2001232113 A JP 2001232113A JP 3728693 B2 JP3728693 B2 JP 3728693B2
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polyester resin
thickener
ethylene
resin composition
weight
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JP2003041100A (en
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万平 堀井
秀紀 菅原
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Aron Kasei Co Ltd
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Aron Kasei Co Ltd
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  • Extrusion Moulding Of Plastics Or The Like (AREA)
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Description

【0001】
【発明の属する技術分野】
本発明はポリエステル樹脂組成物および該ポリエステル樹脂組成物を材料とした中空異形押出成形品に関するものである。
【0002】
【従来の技術】
ポリエステル樹脂は例えばペットボトル等の材料として大量使用されており、したがってポリエステル樹脂廃材も大量に発生している。
上記ポリエステル樹脂廃材は粉砕溶融ペレット化して、再生ポリエステル樹脂として再び各種成形品の材料として使用することが検討されている。しかしながらポリエステル樹脂は再生処理の際の加熱により劣化し、再生ポリエステル樹脂から得られる成形品は耐衝撃性に劣り、商品価値のある成形品に再生することは殆ど不可能である。
そのために従来、再生ポリエステル樹脂に合成ゴムやエラストマー等の改質剤を添加して耐衝撃性を改良することが行なわれている。
【0003】
【発明が解決しようとする課題】
しかし再生ポリエステル樹脂に上記改質剤を添加しても、耐衝撃性を充分回復させることは困難である。
特に再生ポリエステル樹脂を材料として使用して角パイプ等の中空異形押出成形品を製造する場合、押出機のダイから押出された樹脂を真空フォーマを通して整形し、冷却固化するのであるが、該成形物を真空フォーマに通した場合、該真空フォーマの真空吸引用スリットに樹脂が目詰まりを起すと云う重大な問題を生ずる。
【0004】
【課題を解決するための手段】
本発明は上記課題を解決するために、ポリエステル樹脂に、JISK7210表1条件4によるメルトフローレート(MFR)が20g/10分以下の増粘剤と、該ポリエステル樹脂と反応可能な官能基を有する高分子化剤と、ポリカーボネートおよび/またはアクリロニトリル・エチレン・スチレン樹脂とが添加されているポリエステル樹脂組成物を提供するものである。本発明は特に再生ポリエステル樹脂に有用であり、該増粘剤と該高分子化剤、あるいは該増粘剤と該高分子化剤と、該ポリカーボネートおよび/またはアクリロニトリル・エチレン・スチレン樹脂とはあらかじめ混合してポリエステル樹脂改質剤として該ポリエステル樹脂に添加されることが好ましい。更に本発明では上記ポリエステル樹脂組成物を異形押出成形することによって製造された中空異形押出成形品が提供される。
本発明を以下に詳細に説明する。
【0005】
【発明の実施の形態】
〔ポリエステル樹脂A〕
本発明のポリエステル樹脂とは、二価以上の多価アルコールと二価以上のカルボン酸とのエステル化反応によって得られる樹脂であり、例えばポリエチレンテレフタレート(PET)、ポリブチレンテレフタレート等である。
本発明は特に再生ポリエステル樹脂に対して有用である。
【0006】
〔増粘剤〕
本発明においては、特に再生処理により分子量が低くなり、したがって溶融粘度が低くなっている再生ポリエステル樹脂に対しては溶融粘度を増大して押出成形機のダイから溶融物が自重で垂れ下がるドローダウン現象を防止するために、増粘剤を添加することが望ましい。このような増粘剤としては、高溶融粘度を有する樹脂またはエラストマーが選択される。該増粘剤を例示すれば、例えばポリエチレン、ポリプロピレン、エチレン−エチルアクリレート共重合体(EEA)等のポリオレフィン系樹脂またはエラストマー、スチレン−ブタジエン−スチレンブロック共重合体(SBS)、スチレン−エチレン−ブタジエンブロック共重合体(SEBS)等のスチレン系エラストマー、あるいは上記ポリオレフィン系樹脂と上記スチレン系エラストマーおよび/または合成ゴムとのポリマーアロイである。上記合成ゴムとしては例えばアクリルゴム、ブチルゴム、エチレン−プロピレンゴム(EPR,EPDM)、ケイ素ゴム、ウレタンゴム、フッ化物系ゴム、多硫化物系ゴム、グラフトゴム、ブタジエンゴム、イソプレンゴム、クロロプレンゴム、ポリイソブチレンゴム、ポリブテンゴム、イソブテン−イソプレンゴム、アクリレート−ブタジエンゴム、スチレン−ブタジエンゴム(SBR)、アクリロニトリル−ブタジエンゴム(NBR)、ピリジン−ブタジエンゴム、スチレン−イソプレンゴム、アクリロニトリル−クロロプレンゴム、スチレン−クロロプレンゴム等がある。
増粘効果の高い増粘剤としてはポリプロピレンと上記合成ゴムとのポリマーアロイがある。また上記合成ゴムとしてはポリプロピレンと良好な相溶性を有するEPRまたはEPDMやSBRが望ましい。また上記ポリマーアロイを増粘剤として再生ポリエステル樹脂に使用すると、押出し水冷後の予備乾燥の場合樹脂が黄変やブロッキングを起さない。
【0007】
上記増粘剤のメルトフローレート(MFR)はJISK7210表1条件4(試験温度190℃、試験荷重21.18(N))に準拠した測定方法により、0.5〜20 g/10分、望ましくは0.5〜10 g/10分、更に望ましくは0.5〜5 g/10分である。上記増粘剤は通常ポリエステル樹脂100重量部に対して3重量部以上添加され、望ましくは3〜100重量部添加される。上記増粘剤の添加量が3重量部に満たない場合には、増粘効果が顕著でない。また上記増粘剤の増粘効果は、通常ポリエステル樹脂100重量部に対して100重量部を超えて添加しても増粘効果は余り変わらなくなり、飽和する傾向にあるので、増粘剤の添加量は100重量部以下で充分であり、また増粘剤の添加量が100重量部を超えた場合にはポリエステル樹脂と増粘剤との相溶性が余り良くないので相分離を起こすおそれがあり、成形品の美観を損ねるので増粘剤の添加量が100重量部よりも多くなることは好ましくない。
またポリエステル樹脂が、特に再生PET等の再生ポリエステル樹脂である場合には、資源を有効に活用するというリサイクルの観点から鑑みても増粘剤の添加量が多くなることは好ましくない。
本発明においては、上記増粘剤は単にポリエステル樹脂の溶融粘度を増大せしめるのみならず、耐熱性、耐衝撃性、寸法安定性、剛性等を改良する。
【0008】
〔高分子化剤〕
前記再生処理によって低分子量化したポリエステル樹脂を高分子化することによって溶融粘度を上昇させ、また成形される成形品の機械的強度(剛性、耐衝撃性等)を付与するためには高分子化剤を添加することが望ましい。該高分子化剤はポリエステル樹脂に添加される前記増粘剤の相溶化剤としても機能する。
本発明において使用される高分子化剤としてはポリエステル樹脂と反応する官能基を有する樹脂またはエラストマーを使用する。
上記ポリエステル樹脂と反応する官能基としては、例えばエポキシ基、カルボキシル基、イソシアネート基等があり、ポリエステル樹脂と高い反応性を有する点ではエポキシ基が望ましい。このような官能基を有する樹脂またはエラストマーとしてはエチレン−グリシジルメタクリレート(GMA)共重合体、エチレン−アクリル酸共重合体、エチレン−ビニルイソシアネート共重合体等のエチレン系共重合体、上記エチレン系共重合体にスチレンをグラフト共重合せしめたポリスチレングラフトエチレン系共重合体、エポキシ基含有SBS、エポキシ基含有SEBS、エポキシ基含有EEA、カルボキシル基含有SBS、カルボキシル基含有SEBS、カルボキシル基含有EEA等である。また上記高分子化剤と増粘剤のソルビリティーパラメーターの差は1以内であることが望ましい。
【0009】
上記高分子化剤は使用される上記増粘剤と同種の骨格を有するものを選択することが望ましい。例えば増粘剤がポリエチレン、EEA、EPRまたはEPDMのようなオレフィン系増粘剤の場合には、高分子化剤としてエチレン−グリシジルメタクリレート共重合体、エチレン−アクリル酸共重合体、エチレン−ビニルイソシアネート共重合体等のオレフィン系高分子化剤が選択され、増粘剤がSBSあるいはSEBSの場合には、エポキシ基含有SBSあるいはSEBS、カルボキシル基含有SBSあるいはSEBS等のSBSあるいはSEBS系高分子化剤が選択される。上記高分子化剤はポリエステル樹脂100重量部に対して通常0.3〜100重量部好ましくは1.0〜20重量部添加される。上記高分子化剤の添加量が0.3重量部未満であると高分子化効果と増粘剤に対する相溶化効果が充分発揮されず、また100重量部を超えて添加しても該効果に顕著な変化がなく飽和する。
【0010】
上記ポリエステル樹脂に混合される上記増粘剤と上記高分子化剤との混合比率は通常1:1〜10:1重量比とすることが望ましい。即ち高分子化剤の添加量は増粘剤よりも少なくしても添加量が増粘剤の1/10以上であれば高分子化効果は充分発揮されるが、増粘剤と等量を超えて添加した場合には高分子効果は飽和するし、押出成形性も阻害される。
【0011】
〔ポリエステル樹脂改質剤〕
上記増粘剤と上記高分子化剤とを混合してポリエステル樹脂改質剤を調製しておいてもよい。この場合該増粘剤と該高分子化剤との混合比率は通常通常1:1〜10:1重量比とすることが望ましい。上記改質剤はポリエステル樹脂に対して、通常10〜20重量%程度添加される。
【0012】
〔ポリカーボネートおよび/またはアクリロニトリル・エチレン・スチレン樹脂〕
本発明では上記ポリエステル樹脂改質剤に加えて更にポリカーボネート(PC)および/またはアクリロニトリル・エチレン・スチレン樹脂(AES)が添加される。上記PCおよび/またはAESは上記改質剤を添加したポリエステル樹脂100重量部に対して、通常5〜20重量部添加される。上記PCおよび/またはAESの添加量が5重量部未満では添加効果が顕着でなく、また20重量部を越えて添加しても、添加効果はそれ以上向上せず、更に相溶性の問題でポリエステル樹脂成形品の物性や表面性に悪影響が及ぼされる場合がある。
【0013】
〔その他の成分〕
本発明においては、更にポリエステル樹脂の耐熱性、耐衝撃性、寸法安定性、剛性等を改良するために、例えばスチレン−イソプレンゴム(SIR)、スチレン−エチレン共重合体、ポリ(α−メチルスチレン)−ポリブタジエン−ポリ(α−メチルスチレン)共重合体(α−MeS−B−α−MeS)、ポリ(α−メチルスチレン)−ポリイソプレン−ポリ(α−メチルスチレン)、ブタジエン−スチレン共重合体(BS)、エチレン−プロピレン−エチリデン共重合体、エチレン−酢酸ビニル共重合体、エチレン−ブテン−1共重合体、エチレン−プロピレン−エチルデンノルボルネン共重合体、エチレン−プロピレン−ジシクロペンタジエン共重合体、エチレン−プロピレン−1,4ヘキサジエン共重合体、エチレン−ブテン−1−エチリデンノルボルネン共重合体、エチレン−ブテン−1−ジシクロペンタジエン共重合体、エチレン−ブテン−1−1,4ヘキサジエン共重合体、アクリロニトリル−クロロプレン共重合体(NCR)、スチレン−クロロプレン共重合体(SCR)等の樹脂またはエラストマー、炭酸カルシウム、炭酸マグネシウム、硫酸バリウム、硫酸カルシウム、亜硫酸カルシウム、燐酸カルシウム、水酸化カルシウム、水酸化マグネシウム、水酸化アルミニウム、酸化マグネシウム、酸化チタン、酸化鉄、酸化亜鉛、アルミナ、シリカ、ケイ藻土、ドロマイト、石膏、タルク、クレー、アスベスト、マイカ、ガラス繊維、ケイ酸カルシウム、ベントナイト、ホワイトカーボン、カーボンブラック、鉄粉、アルミニウム粉、石粉、高炉スラグ、フライアッシュ、セメント、ジルコニア粉等の充填剤、難燃剤、酸化防止剤、老化防止剤、紫外線吸収剤、帯電防止剤、結晶化促進剤、発泡剤、染料、顔料等の着色剤等が添加されてもよい。
【0014】
〔ポリエステル樹脂と増粘剤および高分子化剤との配合〕
上記成分の混合方法はドライブレンドが望ましく、特に増粘剤と高分子化剤との混合物をペレット化して改質剤を調製し、該ペレット状改質剤にポリエステル樹脂の粉砕物、特にフレーク状の粉砕物を混合し、更にPCおよび/またはAESを混合して、そのまゝあるいは更に該混合物をペレット化して成形材料とすることが望ましい。
【0015】
〔中空異形押出成形〕
図1および図2には本発明の中空異形押出成形に使用される装置が示される。上記成形材料は押出機(1) のホッパー(2) から該押出機(1) のシリンダー(3) 内に投入され、該シリンダー(3) 内で加熱軟化され、モーター(4) により駆動回転せしめられているスクリュー(5) によってダイ(6) に押出される。該成形材料軟化物は該ダイ(6) によって中空異形形状に成形され、真空フォーマー(7) に導入される。
【0016】
該真空フォーマー(7) にあっては、図2に示すように外筒(8) と内筒(9) との間に冷却水路(10)が設けられ、更に該冷却水路(10)に通じる冷却水導入口(11,12) および冷却水排出口(13,14) が設けられ、、更に入口付近には真空ポンプに接続する真空吸引口(15)が設けられ、該内筒(9) には該真空吸引口(15)に通ずる真空吸引用スリット(16)が設けられている。
【0017】
該ダイ(6) によって中空異形形状に成形された成形材料軟化物Mは該真空フォーマー(7) の内筒(9) に導入され、真空吸引用スリット(16)を介して真空吸引口(15)から真空吸引力を及ぼされ、該内筒(9) の内周壁に密着して整形されかつ冷却固化される。この際、該成形材料軟化物Mには上記改質材およびPCおよび/またはAESが添加されているので、材料が真空吸引用スリット(16)に目詰まりしにくゝなる。
【0018】
該成形材料軟化物はこのようにしてダイ(6) によって中空異形形状に成形された後、真空フォーマー(7) によって整形された上で、冷却水槽(17)に導入され、冷却されて成形物M’となる。
以下に本発明の実施例を述べる。
【0019】
〔実施例〕
エポキシ化SBS(高分子化剤)20重量%、低密度ポリエチレン(増粘剤)80重量%を混合して改質剤1を調製する。
【0020】
エチレン−グリシジルメタクリレート共重合体にスチレンをグラフト共重合せしめた高分子化剤20重量%、ポリプロピレンとEPDMとのポリマーアロイ(増粘剤)80重量%を混合して改質剤2を調製する。
【0021】
ペットボトル廃品をフレーク状に粉砕洗浄し、該粉砕物(PET)85重量部、上記改質剤1または改質剤2を15重量部をドライブレンドし、押出機によって加熱溶融混練押出し、ペレタイザーによってペレット化した再生ポリエステル樹脂に表1に示すようにタルクおよびPCまたはAESを混合し、または混合することなく、図1および図2に示す装置によって図3に示す中空異形押出成形品試料Sを作成した。各試料について寸法安定性および真空フォーマー(7) の真空吸引用スリット(16)の目詰まりの有無を調べた。その結果を表2に示す。
【0022】
【表1】

Figure 0003728693
【0023】
【表2】
Figure 0003728693
寸法安定性:図3のaの部分が8mmに近い方が良好であると判定する。
【0024】
表2よれば、PCまたはAESの添加によって目詰まりの他寸法安定性も改良されることが明らかである。
【0025】
【発明の効果】
本発明によれば、ポリエステル樹脂、特に再生ポリエステル樹脂を中空異形押出成形する場合の真空フォーマーの真空吸引用スリットの目詰まりが解消され、大量連続成形工程を支障なく行なうことが出来る。本発明の中空異形押出成形品は、例えば断面四角形のトラフ、断面横長四角形のスノコや風呂の単位材等に有用である。
【図面の簡単な説明】
図1〜図3は本発明の一実施例を示すものである。
【図1】中空異形押出成形用装置の説明図
【図2】真空フォーマー部分の説明断面図
【図3】テスト用試料の断面説明図
【符号の説明】
1 押出機
6 ダイ
7 真空フォーマー
15 真空吸引口
16 真空吸引用スリット
17 冷却水槽
M 成形材料軟化物
M’ 成形物[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyester resin composition and a hollow profile extrusion-molded article made from the polyester resin composition.
[0002]
[Prior art]
Polyester resins are used in large quantities as materials for, for example, PET bottles, and therefore, a large amount of polyester resin waste is generated.
It has been studied that the waste polyester resin material is crushed, melted and pelletized and used again as a recycled polyester resin as a material for various molded products. However, the polyester resin is deteriorated by heating during the regeneration treatment, and a molded product obtained from the recycled polyester resin is inferior in impact resistance, and it is almost impossible to regenerate into a molded product having commercial value.
Therefore, hitherto, it has been practiced to improve the impact resistance by adding a modifier such as synthetic rubber or elastomer to the recycled polyester resin.
[0003]
[Problems to be solved by the invention]
However, even if the modifier is added to the recycled polyester resin, it is difficult to sufficiently restore the impact resistance.
In particular, when producing a hollow profile extrusion molded product such as a square pipe using a recycled polyester resin as a material, the resin extruded from the die of the extruder is shaped through a vacuum former and cooled and solidified. When the resin is passed through a vacuum former, there arises a serious problem that the resin is clogged in the vacuum suction slit of the vacuum former.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has a polyester resin having a thickener having a melt flow rate (MFR) of 20 g / 10 min or less according to JIS K7210 Table 1 Condition 4, and a functional group capable of reacting with the polyester resin. The present invention provides a polyester resin composition to which a polymerizing agent and polycarbonate and / or acrylonitrile / ethylene / styrene resin are added. The present invention is particularly useful for recycled polyester resins. The thickener and the polymerizing agent, or the thickener and the polymerizing agent, and the polycarbonate and / or acrylonitrile / ethylene / styrene resin It is preferable to mix and add to the polyester resin as a polyester resin modifier. Furthermore, the present invention provides a hollow profile extrusion-molded product produced by profile extrusion of the polyester resin composition.
The present invention is described in detail below.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
[Polyester resin A]
The polyester resin of the present invention is a resin obtained by an esterification reaction between a dihydric or higher polyhydric alcohol and a divalent or higher carboxylic acid, such as polyethylene terephthalate (PET) or polybutylene terephthalate.
The present invention is particularly useful for recycled polyester resins.
[0006]
[Thickener]
In the present invention, especially for a regenerated polyester resin having a low molecular weight due to a regeneration process, and thus a low melt viscosity, the melt viscosity is increased and the melt hangs down from the die of the extruder due to its own weight. In order to prevent this, it is desirable to add a thickener. As such a thickener, a resin or elastomer having a high melt viscosity is selected. Examples of the thickener include polyolefin resins such as polyethylene, polypropylene, ethylene-ethyl acrylate copolymer (EEA) or elastomer, styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene. It is a polymer alloy of a styrene elastomer such as a block copolymer (SEBS) or the polyolefin resin and the styrene elastomer and / or synthetic rubber. Examples of the synthetic rubber include acrylic rubber, butyl rubber, ethylene-propylene rubber (EPR, EPDM), silicon rubber, urethane rubber, fluoride rubber, polysulfide rubber, graft rubber, butadiene rubber, isoprene rubber, chloroprene rubber, Polyisobutylene rubber, polybutene rubber, isobutene-isoprene rubber, acrylate-butadiene rubber, styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR), pyridine-butadiene rubber, styrene-isoprene rubber, acrylonitrile-chloroprene rubber, styrene- There is chloroprene rubber.
As a thickener having a high thickening effect, there is a polymer alloy of polypropylene and the above synthetic rubber. The synthetic rubber is preferably EPR, EPDM or SBR having good compatibility with polypropylene. When the polymer alloy is used as a thickening agent in a recycled polyester resin, the resin does not yellow or block in the case of preliminary drying after extrusion water cooling.
[0007]
The melt flow rate (MFR) of the above thickener is preferably 0.5 to 20 g / 10 minutes, preferably by a measuring method based on JIS K7210 Table 1 Condition 4 (test temperature 190 ° C., test load 21.18 (N)). Is 0.5 to 10 g / 10 min, more preferably 0.5 to 5 g / 10 min. The above thickener is usually added in an amount of 3 parts by weight or more, preferably 3 to 100 parts by weight, based on 100 parts by weight of the polyester resin. When the addition amount of the thickener is less than 3 parts by weight, the thickening effect is not remarkable. In addition, the thickening effect of the above thickener is not much changed even when added in excess of 100 parts by weight with respect to 100 parts by weight of the polyester resin. An amount of 100 parts by weight or less is sufficient, and if the addition amount of the thickener exceeds 100 parts by weight, the compatibility between the polyester resin and the thickener is not so good, and phase separation may occur. Further, since the appearance of the molded product is impaired, it is not preferable that the addition amount of the thickener is more than 100 parts by weight.
Further, when the polyester resin is a recycled polyester resin such as recycled PET, it is not preferable that the addition amount of the thickener is increased from the viewpoint of recycling that resources are effectively used.
In the present invention, the thickener not only increases the melt viscosity of the polyester resin, but also improves heat resistance, impact resistance, dimensional stability, rigidity, and the like.
[0008]
[Polymerization agent]
In order to increase the melt viscosity by polymerizing the polyester resin whose molecular weight has been reduced by the regeneration treatment, and to increase the mechanical strength (rigidity, impact resistance, etc.) of the molded article, the polymer resin is used. It is desirable to add an agent. The polymerizing agent also functions as a compatibilizing agent for the thickener added to the polyester resin.
As the polymerizing agent used in the present invention, a resin or elastomer having a functional group that reacts with a polyester resin is used.
Examples of the functional group that reacts with the polyester resin include an epoxy group, a carboxyl group, an isocyanate group, and the like, and an epoxy group is desirable in that it has high reactivity with the polyester resin. Examples of the resin or elastomer having such a functional group include ethylene-glycidyl methacrylate (GMA) copolymers, ethylene-acrylic acid copolymers, ethylene-based copolymers such as ethylene-vinyl isocyanate copolymers, and the above-mentioned ethylene-based copolymers. Polystyrene graft ethylene copolymer obtained by graft copolymerization of styrene with polymer, epoxy group-containing SBS, epoxy group-containing SEBS, epoxy group-containing EEA, carboxyl group-containing SBS, carboxyl group-containing SEBS, carboxyl group-containing EEA, etc. . Further, the difference in solubility parameter between the polymerizing agent and the thickener is desirably within 1 or less.
[0009]
The polymerizing agent is preferably selected from those having the same type of skeleton as the thickener used. For example, when the thickener is an olefin-based thickener such as polyethylene, EEA, EPR or EPDM, an ethylene-glycidyl methacrylate copolymer, an ethylene-acrylic acid copolymer, an ethylene-vinyl isocyanate as a polymerizing agent. When an olefin polymerizing agent such as a copolymer is selected and the thickener is SBS or SEBS, an SBS or SEBS polymerizing agent such as an epoxy group-containing SBS or SEBS, a carboxyl group-containing SBS or SEBS, etc. Is selected. The above polymerizing agent is usually added in an amount of 0.3 to 100 parts by weight, preferably 1.0 to 20 parts by weight, based on 100 parts by weight of the polyester resin. If the addition amount of the polymerizing agent is less than 0.3 parts by weight, the polymerizing effect and the compatibilizing effect with respect to the thickening agent are not sufficiently exhibited, and even if added in excess of 100 parts by weight Saturates without noticeable change.
[0010]
The mixing ratio of the thickening agent and the polymerizing agent mixed in the polyester resin is usually preferably 1: 1 to 10: 1 by weight. That is, even if the addition amount of the polymerizing agent is less than that of the thickening agent, if the addition amount is 1/10 or more of the thickening agent, the polymerizing effect is sufficiently exerted. When added in excess, the polymer effect is saturated, and the extrusion moldability is also inhibited.
[0011]
[Polyester resin modifier]
A polyester resin modifier may be prepared by mixing the thickener and the polymerizing agent. In this case, the mixing ratio of the thickener and the polymerizing agent is usually preferably 1: 1 to 10: 1 by weight. The modifier is usually added in an amount of about 10 to 20% by weight based on the polyester resin.
[0012]
[Polycarbonate and / or acrylonitrile / ethylene / styrene resin]
In the present invention, polycarbonate (PC) and / or acrylonitrile / ethylene / styrene resin (AES) is further added in addition to the polyester resin modifier. The PC and / or AES is usually added in an amount of 5 to 20 parts by weight with respect to 100 parts by weight of the polyester resin to which the modifier is added. When the addition amount of PC and / or AES is less than 5 parts by weight, the effect of addition is not noticeable, and even when added over 20 parts by weight, the effect of addition is not further improved, and there is a problem of compatibility. The physical properties and surface properties of the polyester resin molded product may be adversely affected.
[0013]
[Other ingredients]
In the present invention, in order to further improve the heat resistance, impact resistance, dimensional stability, rigidity and the like of the polyester resin, for example, styrene-isoprene rubber (SIR), styrene-ethylene copolymer, poly (α-methylstyrene). ) -Polybutadiene-poly (α-methylstyrene) copolymer (α-MeS-B-α-MeS), poly (α-methylstyrene) -polyisoprene-poly (α-methylstyrene), butadiene-styrene copolymer Copolymer (BS), ethylene-propylene-ethylidene copolymer, ethylene-vinyl acetate copolymer, ethylene-butene-1 copolymer, ethylene-propylene-ethyldennorbornene copolymer, ethylene-propylene-dicyclopentadiene copolymer Polymer, ethylene-propylene-1,4 hexadiene copolymer, ethylene-butene-1-ethyl N-norbornene copolymer, ethylene-butene-1-dicyclopentadiene copolymer, ethylene-butene-1-1,4 hexadiene copolymer, acrylonitrile-chloroprene copolymer (NCR), styrene-chloroprene copolymer ( SCR) resin or elastomer, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, Alumina, silica, diatomaceous earth, dolomite, gypsum, talc, clay, asbestos, mica, glass fiber, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, stone powder, blast furnace slag, fly ash Fillers such as cement and zirconia powder, flame retardants, antioxidants, anti-aging agents, ultraviolet absorbers, antistatic agents, crystallization accelerators, foaming agents, dyes, pigments and other colorants may be added. .
[0014]
[Combination of polyester resin with thickener and polymerizer]
The blending method of the above components is preferably dry blending, and in particular, a modifier is prepared by pelletizing a mixture of a thickener and a polymerizing agent, and the pelletized modifier is pulverized polyester resin, particularly flaky. It is desirable to mix the pulverized product, and further mix PC and / or AES, and pelletize the mixture as it is or further to form a molding material.
[0015]
(Hollow profile extrusion)
1 and 2 show an apparatus used for hollow profile extrusion of the present invention. The molding material is fed from the hopper (2) of the extruder (1) into the cylinder (3) of the extruder (1), heated and softened in the cylinder (3), and driven and rotated by the motor (4). It is extruded into a die (6) by a screw (5). The softened molding material is molded into a hollow profile by the die (6) and introduced into a vacuum former (7).
[0016]
In the vacuum former (7), as shown in FIG. 2, a cooling water channel (10) is provided between the outer cylinder (8) and the inner cylinder (9), and further leads to the cooling water channel (10). A cooling water introduction port (11, 12) and a cooling water discharge port (13, 14) are provided, and a vacuum suction port (15) connected to a vacuum pump is provided near the inlet, and the inner cylinder (9) Is provided with a vacuum suction slit (16) communicating with the vacuum suction port (15).
[0017]
The softened molding material M molded into a hollow profile by the die (6) is introduced into the inner cylinder (9) of the vacuum former (7), and the vacuum suction port (15 ) Is applied with a vacuum suction force, is in close contact with the inner peripheral wall of the inner cylinder (9), and is cooled and solidified. At this time, since the modifying material and PC and / or AES are added to the softening material M, the material is less likely to be clogged in the vacuum suction slit (16).
[0018]
The molding material softened product is formed into a hollow profile by the die (6) in this way, then shaped by the vacuum former (7), introduced into the cooling water tank (17), cooled and molded. M '.
Examples of the present invention will be described below.
[0019]
〔Example〕
The modifier 1 is prepared by mixing 20% by weight of epoxidized SBS (polymerizing agent) and 80% by weight of low density polyethylene (thickening agent).
[0020]
A modifier 2 is prepared by mixing 20% by weight of a polymerizing agent obtained by graft copolymerizing styrene with an ethylene-glycidyl methacrylate copolymer and 80% by weight of a polymer alloy (thickener) of polypropylene and EPDM.
[0021]
Waste plastic bottles are pulverized and washed into flakes, and 85 parts by weight of the pulverized product (PET) and 15 parts by weight of the above modifier 1 or modifier 2 are dry blended, heated, melted and kneaded and extruded by an extruder, and by a pelletizer. As shown in Table 1, the pelletized recycled polyester resin is mixed with talc and PC or AES, or without mixing, the hollow profile extruded product sample S shown in FIG. 3 is prepared by the apparatus shown in FIGS. did. Each sample was examined for dimensional stability and clogging of the vacuum suction slit (16) of the vacuum former (7). The results are shown in Table 2.
[0022]
[Table 1]
Figure 0003728693
[0023]
[Table 2]
Figure 0003728693
Dimensional stability: It is determined that the portion a in FIG. 3 is closer to 8 mm is better.
[0024]
According to Table 2, it is clear that the addition of PC or AES improves the other dimensional stability of clogging.
[0025]
【The invention's effect】
According to the present invention, clogging of a vacuum suction slit of a vacuum former when a polyester resin, particularly a recycled polyester resin is subjected to hollow profile extrusion molding, is eliminated, and a large-scale continuous molding process can be performed without hindrance. The hollow profile extrusion-molded product of the present invention is useful, for example, for troughs having a square cross section, slats having a horizontally long cross section, bath unit materials, and the like.
[Brief description of the drawings]
1 to 3 show an embodiment of the present invention.
FIG. 1 is an explanatory view of a hollow profile extrusion molding apparatus. FIG. 2 is an explanatory sectional view of a vacuum former part. FIG. 3 is a sectional explanatory view of a test sample.
1 Extruder
6 die
7 Vacuum former
15 Vacuum suction port
16 Vacuum slit
17 Cooling water tank M Molding material softened material M 'Molded material

Claims (5)

ポリエステル樹脂に、JISK7210表1条件4によるメルトフローレート(MFR)が20g/10分以下の増粘剤と、該ポリエステル樹脂と反応可能な官能基を有する高分子化剤と、ポリカーボネートおよび/またはアクリロニトリル・エチレン・スチレン樹脂とが添加されていることを特徴とするポリエステル樹脂組成物A polyester resin, a thickener having a melt flow rate (MFR) of 20 g / 10 min or less according to JIS K7210 Table 1, Condition 4, a polymerizing agent having a functional group capable of reacting with the polyester resin, polycarbonate and / or acrylonitrile・ Polyester resin composition characterized by adding ethylene / styrene resin 上記増粘剤と高分子化剤とはあらかじめ混合してポリエステル樹脂改質剤として該ポリエステル樹脂に添加されている請求項1に記載のポリエステル樹脂組成物The polyester resin composition according to claim 1, wherein the thickener and the polymerizing agent are mixed in advance and added to the polyester resin as a polyester resin modifier. 上記増粘剤と高分子化剤と、ポリカーボネートおよび/またはアクリロニトリル・エチレン・スチレン樹脂とはあらかじめ混合してポリエステル樹脂改質剤として該ポリエステル樹脂に添加されている請求項1に記載のポリエステル樹脂組成物The polyester resin composition according to claim 1, wherein the thickener, the polymerizing agent, and the polycarbonate and / or acrylonitrile / ethylene / styrene resin are mixed in advance and added to the polyester resin as a polyester resin modifier. object 該ポリエステル樹脂は再生ポリエステル樹脂である請求項1〜3のいずれか1項に記載のポリエステル樹脂組成物The polyester resin composition according to any one of claims 1 to 3 , wherein the polyester resin is a recycled polyester resin. 請求項1〜4のいずれか1項に記載のポリエステル樹脂組成物を異形押出成形することによって製造されたことを特徴とする中空異形押出成形品A hollow profile extrusion molded article produced by profile extrusion of the polyester resin composition according to any one of claims 1 to 4.
JP2001232113A 2001-07-31 2001-07-31 Polyester resin composition and hollow profile extrusion molded product Expired - Fee Related JP3728693B2 (en)

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